📄 Description (English)
SonicWall Email Security Unrestricted Upload of File Vulnerability — SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.
🤖 AI Executive Summary
CVE-2021-20022 is a critical post-authenticated file upload vulnerability in SonicWall Email Security (CVSS 9.0) that allows attackers to upload dangerous file types to the remote host. This vulnerability is actively exploited in conjunction with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation. Given the widespread deployment of SonicWall Email Security in Saudi organizations and the availability of working exploits, immediate patching is essential to prevent unauthorized system compromise.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 22:54
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses critical risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), telecommunications providers (STC, Mobily), and energy sector organizations (ARAMCO, SEC). SonicWall Email Security is widely deployed as a perimeter email gateway in these sectors. Successful exploitation enables attackers to upload web shells, malware, or backdoors, leading to complete system compromise, data exfiltration, and lateral movement within critical infrastructure networks. The post-authentication requirement is mitigated by the prevalence of credential compromise in targeted attacks against Saudi organizations.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Telecommunications
Energy and Utilities
Healthcare
Education
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all SonicWall Email Security instances in your environment and document versions
2. Restrict access to SonicWall Email Security administrative interfaces to trusted IP ranges only
3. Implement strict file upload validation at the application level
4. Monitor email gateway logs for suspicious file upload activities
PATCHING GUIDANCE:
1. Apply the latest SonicWall Email Security security patches immediately (consult SonicWall security advisories for specific version patches)
2. Test patches in a non-production environment before deployment
3. Prioritize patching for systems exposed to untrusted networks
COMPENSATING CONTROLS (if patching delayed):
1. Implement Web Application Firewall (WAF) rules to block file upload endpoints
2. Disable file upload functionality if not operationally required
3. Implement strict file type validation and sandboxing for uploaded files
4. Deploy intrusion detection signatures for CVE-2021-20022 exploitation attempts
DETECTION RULES:
1. Monitor for HTTP POST requests to file upload endpoints with suspicious file extensions (.jsp, .aspx, .php, .exe, .sh)
2. Alert on multiple failed authentication attempts followed by successful uploads
3. Track file uploads with MIME type mismatches
4. Monitor for process execution from email gateway upload directories
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع مثيلات SonicWall Email Security في بيئتك وتوثيق الإصدارات
2. قيد الوصول إلى واجهات إدارة SonicWall Email Security على نطاقات IP موثوقة فقط
3. تطبيق التحقق الصارم من تحميل الملفات على مستوى التطبيق
4. مراقبة سجلات بوابة البريد الإلكتروني للأنشطة المريبة في تحميل الملفات
إرشادات التصحيح:
1. تطبيق أحدث تصحيحات أمان SonicWall Email Security على الفور (استشر إشعارات أمان SonicWall للحصول على تصحيحات إصدار محددة)
2. اختبر التصحيحات في بيئة غير إنتاجية قبل النشر
3. أولويات التصحيح للأنظمة المكشوفة للشبكات غير الموثوقة
الضوابط البديلة (إذا تأخر التصحيح):
1. تطبيق قواعد جدار حماية تطبيقات الويب (WAF) لحظر نقاط نهاية تحميل الملفات
2. تعطيل وظيفة تحميل الملفات إذا لم تكن مطلوبة تشغيلياً
3. تطبيق التحقق الصارم من نوع الملف والعزل الرملي للملفات المحملة
4. نشر توقيعات كشف التطفل لمحاولات استغلال CVE-2021-20022
قواعد الكشف:
1. مراقبة طلبات HTTP POST إلى نقاط نهاية تحميل الملفات بامتدادات ملفات مريبة (.jsp, .aspx, .php, .exe, .sh)
2. تنبيه على محاولات مصادقة متعددة فاشلة متبوعة بتحميلات ناجحة
3. تتبع تحميلات الملفات مع عدم تطابق نوع MIME
4. مراقبة تنفيذ العملية من أدلة تحميل بوابة البريد الإلكتروني
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 - Information security requirements for supplier relationships
ECC 2024 A.12.6.1 - Management of technical vulnerabilities
ECC 2024 A.12.2.1 - Establishment of information security baselines
🔵 SAMA CSF
SAMA CSF ID.BE-1 - Organizational context and risk management
SAMA CSF PR.IP-12 - Information and records management
SAMA CSF DE.CM-1 - Detection processes and tools
🟡 ISO 27001:2022
ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
ISO 27001:2022 A.14.2.1 - Supplier relationship information security
ISO 27001:2022 A.8.1.1 - Inventory of information and other assets
🟣 PCI DSS v4.0
PCI DSS 6.2 - Security patches and updates
PCI DSS 6.5.1 - Injection flaws prevention
PCI DSS 11.2 - Vulnerability scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
SonicWall:SonicWall Email Security